Granted Patent
Utility
US 4,143,449 · App. 05/833,889
Wheel forming machine
Inventors:
John A. Main, David Trevarrow
Patented Case
View Patent ↗
Granted: Mar 13, 1979
Filed: Sep 16, 1977
Inventors
John A. Main
David Trevarrow
Assignee (at issue)
KELSEY-HAYES-COMPANY
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.